| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in which: when users make a call by selecting a network, it is very difficult for all the users to learn whether they can make a call on an opposite party through an IP network or NGN network.SOLUTION: A communication terminal device includes server/gateway registration means for registering a SIP server, a T.38 gateway, and a home gateway. It includes a call destination information registration means 108 for registering call destination information including a call destination telephone number and a call origination network. It includes selection network setting registration means 109 capable of registering specified information on the call destination information, and the corresponding SIP server, T.38 gateway, and home gateway registered by the server/gateway registration means by adding a priority to them. It includes call origination network determination means 111 for comparing the call destination information registered by the call destination information registration means with the specified information registered by the selection network setting registration means according to the priority registered by the selection network setting registration means and determines a network about which both information accords. It includes call origination means 113 for making a call through the network determined by the call origination network determination means. |
